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Shawn Wehe, David Sonnenfroh, Mark Allen, Claire Gmachl, Federico Capasso, "Measurements of Trace Pollutants in Combustion Flows Using Room-Temperature, Mid-IR Quantum Cascade Lasers," AIAA 2002-0824, presented at 40th AIAA Aerospace Sciences Meeting and Exhibit (Reno, NV) , (14-17 January 20022002).
AbstractMeasurements of CO and NO are reported using thermo-electrically cooled, mid-IR quantum cascade lasers operating near 4.6 and 5.26 µm, respectively. Measurements of NO in H2-air and CH4-air flames at temperatures of approximately 780 and 1600 K are presented along with room-temperature CO measurements. Sensitivities on the order of 1.5 ppm-m are achieved in the case of NO in a flame using a balanced ratiometric detection technique. Comparisons between measured and predicted water-vapor interference is discussed. demands on a fixed geometry combustor concept and suggests that adaptive operating modes involving fuel or air distribution may be required to ensure safe and low-emission performance. sr-1089
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